Across
- 3. subatomic particle that has negative charge
- 5. the sum of number of protons and neutrons in an atom
- 6. a horizontal row of elements in the periodic table
- 8. an atom’s central region made of protons and neutrons
- 9. a vertical column of elements in the periodic table
- 10. subatomic particle that is neutral in charge
- 11. the number of protons in an atom
Down
- 1. a region around the nucleus where electrons are located
- 2. electrons in the outermost orbital
- 4. subatomic particle that has positive charge
- 7. atoms with same number of protons but different number of neutrons
- 12. a charged atom by losing or gaining electrons